MapView – Current Location in Swift

MapView – Display User’s Current 

Location and Drop a Pin

** Write in ViewController.swift

import UIKit

import CoreLocation

import MapKit

class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {

    

    var locationManager:CLLocationManager!

    var mapView:MKMapView!

    

    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

    }

    

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

    

    override func viewWillAppear(_ animated: Bool) {

        super.viewWillAppear(animated)

        

        // Create and Add MapView to our main view

        createMapView()

    }

    

    override func viewDidAppear(_ animated: Bool) {

        super.viewDidAppear(animated)

        

        determineCurrentLocation()

    }

    func createMapView()

    {

        mapView = MKMapView()

        

        let leftMargin:CGFloat = 10

        let topMargin:CGFloat = 60

        let mapWidth:CGFloat = view.frame.size.width-20

        let mapHeight:CGFloat = 300

        

        mapView.frame = CGRect(origin: CGPoint(x: leftMargin,y :topMargin), size: CGSize(width: mapWidth, height: mapHeight))

        

        mapView.mapType = MKMapType.standard

        mapView.isZoomEnabled = true

        mapView.isScrollEnabled = true

        

        // Or, if needed, we can position map in the center of the view

        mapView.center = view.center

        

        view.addSubview(mapView)

    }

    

    func determineCurrentLocation()

    {

        locationManager = CLLocationManager()

        locationManager.delegate = self

        locationManager.desiredAccuracy = kCLLocationAccuracyBest

        locationManager.requestAlwaysAuthorization()

        

        if CLLocationManager.locationServicesEnabled() {

            //locationManager.startUpdatingHeading()

            locationManager.startUpdatingLocation()

        }

        

        // Call stopUpdatingLocation() to stop listening for location updates,

        // other wise this function will be called every time when user location changes.

        //manager.stopUpdatingLocation()

        

        let center = CLLocationCoordinate2D(latitude: (locationManager.location?.coordinate.latitude)!, longitude: (locationManager.location?.coordinate.longitude)!)

        let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))

        

        mapView.setRegion(region, animated: true)

        

        // Drop a pin at user's Current Location

        let myAnnotation: MKPointAnnotation = MKPointAnnotation()

        myAnnotation.coordinate = CLLocationCoordinate2DMake((locationManager.location?.coordinate.latitude)!, (locationManager.location?.coordinate.longitude)!);

        myAnnotation.title = "Current location"

        mapView.addAnnotation(myAnnotation)

        

    }

}